Hi! Welcome to Nitro Express!

Looks like it might have a BSA piled arms trademark on the top of the barrel knox form. Does it? Maybe this is what Huvius is talking about...it could be mistaken for the Westley Richards triangle.
What is the barrel length?
What does the front sight look like?
Is there a "V" in a circle anywhere on the barrel?
Is there anything stamped on the top-right-rear part of the action, where the bolt slides in?
What are the numbers on the bolt? Do they match the numbers on the action or barrel?

From the pics, it looks like a military pattern, commercial Lee Enfield (not sure exactly which model until we get more data), made by Birmingham Small Arms Company sometime between 1897 and 1905, and then later sporterized by its owner. With more info, we'll find the answers to your questions and narrow down the date range.

If you would be willing to fill out my Lee Speed owner's survey, I will send you a PM. Every bit of data I can gather puts me a step closer to working out a reliable method of dating these commercial rifles.

Thanks!